On an application like that, I'd do anything possible to find a way to mount a MinnKota slide plate mount. That would allow you to slide the motor back several inches for docking, running the lake, or trailering but slide forward to operate the motor. You might look into Jack Nuts or one of the other expandable connectors out there.
I have a very similar set-up on my Excel BayPro 203 and wouldn't think of rigging it without the MKA47 MinnKota plate. The MKA47 is now MKA51